Unlobed, broad-ovate, medium green leaves (to 4” long) with irregular doubly serrate margins are found on mature trees. Fall: Red to orange. Embers Amur Maple is a multi-stemmed deciduous tree with a more or less rounded form. The small black dots appear on the upper portions of leaves. A fungal infection of the soil that penetrates a tree’s roots, verticillium wilt takes … But that’s about the extent of the issue. The disease develops on defoliated debris that remains on the ground during the winter months. Timely Topics (poison ivy reminder; a leaf spot disease of ash) E-samples (brown felt blight on spruce; earwigs) August 8, 2014. After overwintering, the tarlike lesions on fallen leaves produce sexual spores that infect young maple leaves and continue the cycle of infection for another season. Planting: Your Amur Flame Maple will grow in any spot in your yard that gets full sun or partial shade, but more sun will produce brighter colors in the fall. A. ginnala (Amur Maple) 20'. Performs well in full sun or bright, sun-dappled locations. On Norway maple, The University of Minnesota lists anthracnose (Discula spp. Leaves turn yellow and red in fall. Interesting specimen shrub or tree for the landscape but listed as invasive in some states. This document is ENH-173, one of a series of the Environmental Horticulture, UF/IFAS Extension. Review of risks should be undertaken before selecting this tree for planting sites. ginnala and its cultivars are more often found in cultivation than A. tataricum. Providing 3 or 4 inches of mulch around the tree’s trunk and roots helps to keep the soil moist and to absorb excess water. The fungus doesn’t infect the inside of the tree, and it doesn’t have any severe parasitic action. Where is this species invasive in the US. A fungus called Rhytisma acerinum is responsible for this. It is native to forested areas from western Asia to southeastern Europe. Leaves on young trees are often 3 lobed. Phyllosticta leaf spot is similar in many ways to other foliar diseases of maple such as anthracnose (see University of Wisconsin Garden Facts X1001a) and tar spot (see University of Wisconsin Garden Facts X1126). Amur Maple is a tough, cold-hardy tree that gives you an easy way to add some hot fall color to your landscape. 1. Subsp. You'll love the flaming red tones these Maple leaves turn in sunny locations (in shadier spots, you'll get more orange and yellow). Large groups of aphids can damage leaves and cause them to drop early. The disease doesn’t prove to be harmful to the health of the autumn blaze maple but it surely creates ugly looking tar spots on the leaves of the plants. Maple tar spot is a very visible problem for maple trees. Tar spot is a fungal disease that infects the foliage of the Deborah maple tree. ginnala (formerly Acer ginnala), is commonly called Amur maple. These spots have tan to brown centers and typically a purple, red, or brown margins. This document is ENH-174, one of a series of the Environmental Horticulture, UF/IFAS Extension. A small multi-trunk maple, upright spreading tree with a dense, rounded crown that matures over time to a 15 - 20' tall tree or multi-stemmed shrub. Phyllosticta leaf spot produces a few small lesions on some of the tree’s foliage. Acer tataricum, commonly called Tatarian maple, typically grows as a small, upright spreading tree with a dense, rounded crown or as a large multi-stemmed shrub.

The specific plant you are looking for could not be found in our plant database. The maple tree tar spot is fairly easy to identify. Phyllosticta leaf spot is similar in many ways to other foliar diseases of maple such as anthracnose and tar spot. Upright and rounded habit. Amur maples are usually pest-free, but aphids can sometimes be a problem. Also, grass does not grow well underneath a maple tree’s canopy because feeding roots are shallow and often exposed above the ground. ... Tar spot and a variety of leaf spots cause some concern among homeowners but are rarely serious enough for control. The spores develop during the winter on leaves that have fallen to the ground the previous summer and fall. Footnotes. Tar spots typically appear in June, starting out a pale yellow that darkens over time. Some tolerance for drought. Pathogens and fungal spores on Amur maples may cause the trees to develop a variety of leaf spots. Fall: scarlet. The small black dots appear on the upper portions of leaves. Fungal spores may develop when the roots, trunk and lower leaf growth cannot easily absorb moisture. Winged red seed. Several fungi in the Rhytisma family produce tar spot on maple trees. This tree is also adaptable to all pH levels and most soil types except finely textured soils like clay. White/purple flowers, April. ‘Red Fruit’ Amur Maple1 Edward F. Gilman and Dennis G. Watson2 INTRODUCTION Amur maple is an excellent, low-growing tree for small yards and other small-scale landscapes (Fig. The leaves, which reach up to 4” long, are serrated and broad-ovate. It matures over time to 15-20’ tall. Springtime winds carry newly developed fungal spores to the tree’s budding leaves. Timely Topics (Squirrel damage to hackberries) E-samples (hackberry island chlorosis; leafcutter bees; walnut anthracnose) July 30, 2014. Amur maple, a small deciduous tree formerly listed as A. ginnala, is native to China and Japan.It does particularly well in … Although tar spots can cause early leaf drop, they are not a serious health threat to Amur or other species of maple trees, according to Cornell University’s department of plant pathology. It is native to forested areas from western Asia to southeastern Europe. Borer insects that drill themselves into woody trunks and branches may severely damage trees. Another form of tar spot affects striped and Norway maples. Pruning and fertilizing trees with lightly infected branches may help them produce new growth. Mature Amur Maple. What Causes Tarlike Spots on a Sycamore Tree? Luckily, this disease is generally a cosmetic problem, rather than a real health issue for trees. General Information on Maples. Acer tataricum, commonly called Tatarian maple, typically grows as a small, upright spreading tree with a dense, rounded crown or as a large multi-stemmed shrub. While this affects maple trees in general, it especially targets Norway, silver, and sugar varieties. During the spring, the fungal spores infect the foliage of the tree. It can be grown as a multi-stemmed clump or can be trained into a small tree with a single trunk up to 4 to 6 feet tall. Dense foliage with fine-textured leaves. Purple-bordered leaf spot (l). Zone 2. Infected areas on the wood darken to a deep green color before the branches sag. Acer tataricum, commonly called Tatarian maple, typically grows as a small, upright spreading tree with a dense, rounded crown or as a large multi-stemmed shrub. Watch for aphids, borers, scale, leafhoppers, caterpillers and mites. This is because a fungal pathogen in … What causes maple leaf black spot? Brown spots appearing on maple tree leaves or on the leaves of box elder trees are typically caused by something known as tar spot. Removing infected foliage from the tree, raking and then destroying fallen leaves are steps toward reducing the number of flying fungal spores, but doing so may not eliminate them completely. A. circinatum (Vine Maple) 25'. It’s common goeas by the name “tar spot” or “black tar spot” because it’s black as pitch. Growth Rate: Growth rate is varied, depending on the species. Easily grown in moist, organically rich, well-drained soils in full sun to part shade. Fungicides may help, but the entire tree and its neighbors must be covered, a difficult task to perform on mature maples. It starts with small yellow spots on growing leaves, and by late summer these yellow spots expand into large black blotches that look like tar has been dropped on the leaves. Tar Spots. Amur Maple1 Edward F. Gilman and Dennis G. Watson2 INTRODUCTION Amur maple is an excellent, low-growing tree for ... Acer ginnala-- Amur Maple Page 4 Tar spot and a variety of leaf spots cause some concern among homeowners but are rarely serious enough for control. She has done work for stations including WTVN, WMNI and WOSU (NPR). The Amur maple grows best in U.S. Department of Agriculture plant hardiness zones 3 through 8, which means it can tolerate low temperatures and ice and snow. This fungal disease gets its name from the fact that the dark brown spots resemble tar. ... Tar spot and a variety of leaf spots cause some concern among homeowners but are rarely serious enough for control. 1). The tar spot seen on maples is caused by three related fungi, Rhytisma acerinum, R. americanum and R. punctatum. Scorch is a disease brought on by hot, windy days. It is native to China, Mongolia, Manchuria, Siberia (along the Amur River Valley), Korea and Japan. It matures over time to 15-20’ tall. Silver has a Bachelor of Arts in journalism with an English minor from The Ohio State University. Generally, sugar maple (A. saccharum), Amur maple (A. ginnala) and paperbark maple (A. griseum) are not suited to the Coastal Plains. Commercial pesticides and the aphids’ natural enemies, predatory insects, may control infestation. This is actually a harmless autumn blaze maple disease that is caused by fungus and pathogens. ), phyllosticta (Phyllosticta minima) and tar spot (Rhytisma acerinum) as three common fungal pathogens. Let’s first get to the root of the matter and talk about the cause of those blemishes. 1. Amur maple is an excellent, low-growing tree for small yards and other small-scale landscapes. Foliage will initially develop small, pale yellow spots that turn black as the disease progresses. Wet weather conditions prompt the lesions and fungi to grow. Though some are used for the commercial syrup industry, many others are planted simply for the enjoyment, shade and beauty they provide. Verticillium may be the cause of wilting and falling branches. Signs & Symptoms of Red Oaks With Oak Wilt, University of Nevada Extension: General Care of Maples: Managing Phyllosticta Leaf Spot Disease, University of Florida Extension: Amur Maple: E. Gilman & D. Watson, North Dakota State University: Trees: Amur Maple, Cornell University Plant Pathology: Tar Spots of Maple, U. S. Department of Agriculture: Plant Guide: Amur Maple, University of Rhode Island Horticulture: Leaf Spot Diseases of Ornamental Trees & Shrubs, Ohio State University Extension: Leaf Diseases on Ornamental Trees and Shrubs: S. Nameth, etal. Tiny black fungal spots often develop inside of the lesions. The Garden wouldn't be the Garden without our Members, Donors and Volunteers. Trees with verticillium may be salvageable if they have only a few affected branches; however, severely diseased maples are not likely to respond to any treatment. Tiny, black, pimple-like reproductive structures (called pycnidia) often form within the spots… Teri Silver began a career in 1984 as a news, sports and feature writer/reporter, anchor, editor, producer and program host for central Ohio radio and television stations. Other pests include: Diseases like giant tar spot (Rhytisma acerinum) and leaf spots are possible but are not serious problems for the Amur maple. Amur maple has invasive traits that enable it to spread aggressively. Wide-spreading with dense foliage. Neighboring trees are susceptible to catching the fungi; you must rake and remove their leaves as well. No serious insect or disease problems. One tree can produce more than 5,000 two-winged seeds that are widely spread by wind. Zone 5. Within the leaf spots (r), small, black, pimple-like fungal fruiting bodies form (red arrows). Screen. Verticillium Wilt. Purple-bordered leaf spot (also called eye spot or Phyllosticta leaf spot) is a common, but primarily cosmetic disease that affects maples (in particular Amur, Japanese, red, silver and sugar maple). The trees, however, are susceptible to many diseases, some of which produce brown spots on the leaves. Tar spot and other leaf spots are other concerns with the Amur Maple, but they are not serious diseases. On these trees 20 to 50 small spots, each no larger than a pin-head, appear in late July or early August. This tree is under observation and may be listed on official invasive species lists in the near future. Maple trees whose roots are not absorbing water are prone to scorch. Mature Height/Spread: Maples vary in size from a small Japanese maple (8 feet) to a large sugar maple (100 feet). Spores that germinate insert themselves into the leaf tissue. The tarlike spots don’t appear until late summer or fall. All maple trees are susceptible to Phyllosticta leaf spot. Flowers are followed by winged samaras (to 1” long) that turn a showy red in summer/fall as they mature. Maple tar spot is mostly a cosmetic issue. It is also found in the far east of Russia in the Amur River valley region, where it takes its name from. Tar spot is a fungal disease that causes a great deal of concern for home gardeners due to its appearance. © Copyright 2020 Hearst Communications, Inc. 'Mandy', commonly marketed under the trade name of RED RHAPSODY, is noted for having shiny green leaves which turn an excellent scarlet red (as emphasized by the trade name) in fall. Dwarf Compact Amur Maple Zones 3-8 'Bailey Compact' is a an excellent dwarf compact selection of Amur maple by Bailey's Nurseries. Verticillium wilt, stem canker, leaf spots, tar spot and anthracnose may appear. Winged seeds. Fertilizer is generally unnecessary for Amur maple trees growing on lawns and in gardens—particularly if those areas receive regular feedings. Tar spot will not kill your trees, but it's unsightly and … One tree can produce more than 5,000 two-winged seeds that are widely spread by wind. AY-ser tat-TAR-ee-kum Description. Amur maple is an excellent, low-growing tree for small yards and other small-scale landscapes. Horticultural oil-based sprays may control scales, such as the cottony maple scale, which creates cottonlike masses on lower sides of branches. Fragrant, greenish-yellow flowers are followed by red-winged samaras (to 1" long).Genus name is the Latin name for a maple tree.Specific epithet is in reference to certain areas of Siberia and Mongolia (Tatary) that were invaded and occupied in the Middle Ages by the Tatars. Wet leaves and fungal spores encourage the growth of pycnidia: tiny black fruiting dots. One reason is that wind carries fungal spores from one tree to another. It also matures over time to 15-20' tall as a large shrub or small tree. If trees do not absorb enough water, they will scorch, showing tan-colored areas and dead spots in leaf veins. The Flame Amur Maple grows as a small upright tree with a rounded crown or as a large multi-stemmed shrub. Amur Flame Maples do not like excessive water, so be sure to plant in a spot that is very well-draining. At the beginning, these tar spots are pale yellow in color that later on turn dark. It may affect only a small portion of the tree; however, a severe infestation will weaken the Amur maple and cause its leaves to drop by mid- to late summer. Iron chlorosis develops as a result of iron deficiency when the plants grow in alkaline soils or poorly drained soils. Black spores grow in the middle of the yellow spots. Maple trees are among the most popular shade trees in North America. The fungus overwinters on fallen, diseased maple leaves. How to Protect the Amur Maple (Acer Ginnala) from Pests and Diseases? It is native to forested areas from western Asia to southeastern Europe. The Amur maple tree can tolerate a wide variety of soils, is poor soil fertility, and is pH adaptable. On striped maple, the spots do not enlarge much after they first appear. British Columbia-California. 1. In recent years, tar spot caused by R. acerinum has been increasing in frequency and severity in Michigan. In comparison to the species, its leaves are (a) more lustrous, (b) distinctively three-lobed with a long central lobe and (c) better red (although variable) fall color. Amur maple trees (Acer ginnala) are well-suited for small backyards and patios. It is native to forested areas from western Asia to southeastern Europe. Make the soil more acidic as needed. Rake up and destroy maple leaves in autumn to reduce the amount of inoculum for the following spring. Amur Maples are deciduous spreading trees that can reach up to 20 feet at full maturity, even with a … It's caused by a fungal pathogen in the genus Rhytisma. Footnotes. Figure 1. Best performance occurs in areas with cool summer climates. The dots bring down the look of your tree – and can even cause early leaf drop. a spot of tar. These spots contain dead tissue that dries up and breaks through the leaves. Subsp. It matures over time to 15-20’ tall. Amur maples produce emerald-green leaves that become bright red in the autumn. However, the Amur Maple is native to northeastern Asia, found in Mongolia, Japan and Korea. Maple tar spot rarely does any damage to the tree’s health. Mature ‘Red Fruit’ Amur Maple. The surface of the spot may have a pattern of wavy indentations or ripples. E-samples (mites on viburnum; saltcedar in bloom; tar spot appearing) July 23, 2014 Acer Ginnala Flame is also known as the Tatarian maple, in reference to certain areas of Siberia and Mongolia that were invaded by the Tatars in the Middle Ages. Greenish-white flowers in erect, long-peduncled panicles bloom in spring. Several fungi in the Rhytisma family produce tar spot on maple trees. The trees grow about 20 to 30 feet tall; thriving in U. S. Department of Agriculture plant hardiness zones 3a through 8b (minus 40 degrees Fahrenheit through 20 F). It prefers cold to heat and grows best where summer temperatures are not high and where humidity is low. Transplants easily.RED RHAPSODY often grows poorly in the heat and humidity of the deep South. The irregularly-shaped, round lesions are nearly a quarter of an inch wide and yellow-brown in color. If it has too much moisture, it can develop leaf spots and is more prone to disease.

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